As valuations become increasingly stretched in today’s concentrated market, investors may be wondering where to break away from the typical market-cap weighted approach. Fundamental indexing can do just that, and investors appear to be gravitating to this methodology given the latest asset accumulation data. The Invesco RAFI US 1000 ETF (PRF ) officially crossed the $10 billion assets under management (AUM) threshold in August, solidifying its position as a cornerstone strategy for those seeking smart-beta and large-cap equity exposure in the convenience of one ETF.
Key Takeaways:
- PRF surpassed $10 billion in AUM in late August 2026, driven by consistent institutional creation flows and market appreciation.
- This fund tracks the RAFI Fundamental Select US 1000 Index. PRF selects and weights the 1,000 largest U.S. equities by economic footprint rather than market capitalization.
- This fundamentals-driven framework provides a disciplined, cost-efficient core equity strategy. This decouples portfolio weights from volatile share prices to systematically avoid overvalued mega-cap momentum traps.
Steady Institutional Inflows Drive Growth
According to recent weekly flow data, PRF crossed the $10 billion mark during the week ending August 14, 2026. It climbed from $9.96 billion to $10.01 billion in ending AUM behind $3.93 million in net creation flows and $50.37 million in asset appreciation.
Demand continued to surge into the final days of the month. By the end of the month, net creation flows accelerated sharply, pulling in $8.98 million in fresh capital and cementing the ETF’s assets at $10 billion. As mentioned, this landmark milestone reflects sustained investor adoption of this fund’s fundamental indexing methodology over traditional market-cap weighting strategies.
The Power of Fundamental Indexing
Launched in late 2005, PRF tracks the RAFI Fundamental Select US 1000 Index (the “Index”). Traditional market-cap-weighted indexes assign portfolio weights based strictly on equity prices. Therefore, this can force funds to overweight overvalued stocks while under-weighting undervalued companies. By contrast, PRF selects and weights 1,000 of the largest U.S. equities. It bases this on four core fundamental measures of firm size:
- Adjusted sales: a firm’s true share of total economic activity
- Book value: a company’s net assets on its balance sheet that are independent of market price
- Operating cash flow: real, liquid cash generation as opposed to paper accounting profits
- Dividends and buybacks: direct capital returned to shareholders.
Taken together, these metrics comprise a stock’s economic footprint. This ensures that a company’s fundamental weight in the index reflects its true operational scale rather than its fluctuating market valuation.
As broad markets experience heightened concentration in mega-cap momentum names, PRF provides investors with a transparent, cost-efficient, and liquid core equity vehicle. It offers something different from the typical market-cap-weighted approach. Crossing $10 billion in total assets validates the durability of Research Affiliates’ fundamental methodology and highlights growing investor demand for fundamentals-driven core exposure.
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VettaFi LLC (“VettaFi”) is the index provider for PRF, for which it receives an index licensing fee. However, PRF is not issued, sponsored, endorsed, or sold by VettaFi, and VettaFi has no obligation or liability in connection with the issuance, administration, marketing, or trading of PRF.
